Abstract:
:The deposition of immune complexes, followed by activation of complement and/or Fc receptors and generation of chemoattractants, is the most common feature of human glomerulonephritis. Recently we have shown that primary cultured human glomerular mesangial cells (HMC), which are normally negative for IgG Fc receptors, can be stimulated to express the low-affinity FcgammaRIII-A receptor isoform. In this study we further demonstrate that activation of HMC through IFN-gamma resulted in the functional expression of the high-affinity Fc receptor for IgG (FcgammaRI, CD64). IFN-gamma-dependent induction of classical FcgammaRIa1 mRNA as well as a2, b2 splice variants were evident after 24 h in proliferating HMC and after 48 h in resting HMC. Transcription of FcgammaRI mRNA was also induced by IL-10 in proliferating HMC, whereas other cytokines such as IL-3, transforming growth factor-beta1 and granulocyte-macrophage colony-stimulating factor were not effective. Cell surface expression of FcgammaRI could be detected by flow cytometric analysis after IFN-gamma stimulation and was accompanied by the augmentation of MHC class II and the up-regulation of intercellular adhesion molecule-1 expression. Triggering of HMC by cross-linking FcgammaRI with F(ab')2 fragments of the anti-CD64 monoclonal antibody 22 led to enhanced synthesis of mRNA for the chemokines IL-8 and monocyte chemoattractant protein-1, indicating that the FcgammaRI of HMC is functionally active. These in vitro data suggest that engagement of both FcgammaRI and FcgammaRIII-A on activated HMC through IgG immune complexes may result in an increased chemoattraction of leukocytes into the glomerulus, contributing to the development of glomerulonephritis.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Uciechowski P,Schwarz M,Gessner JE,Schmidt RE,Resch K,Radeke HHdoi
10.1002/(SICI)1521-4141(199809)28:09<2928::AID-IMMsubject
Has Abstractpub_date
1998-09-01 00:00:00pages
2928-35issue
9eissn
0014-2980issn
1521-4141pii
10.1002/(SICI)1521-4141(199809)28:09<2928::AID-IMMjournal_volume
28pub_type
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journal_title:European journal of immunology
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abstract::The pathogenesis of the decline of CD4 lymphocyte counts accompanying the typical course of HIV-1 infection is not completely defined and might be related to a differential susceptibility of naive and memory cells to HIV-1 exposure. Here, we examined the effects induced by heat-inactivated HIV-1 virions on these lymph...
journal_title:European journal of immunology
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abstract::As we approach the centenary of Elie Metchnikoff's Nobel Prize (1908), it is opportune to reflect upon the history of macrophage immunobiology, take stock of current knowledge and anticipate questions for the future. Starting from his appreciation of phagocytosis as an important determinant of host defence against inf...
journal_title:European journal of immunology
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abstract::When cytotoxic titrations were made of rabbit anti-mouse brain and anti-Thy-1.2 sera against mouse lymphoid cells in the presence of sodium barbital or xylocaine, it was observed that a proportion of T cells were much more sensitive (50 x) than the remainder. This effect could be detected with ethidium or fluorescein ...
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abstract::The recent discovery of IL-17-producing CD4(+) Th subset significantly revised the Th1/Th2 dichotomy model proposed by Mosmann and Coffman almost two decades ago. Th17 cells are involved in the pathogenesis of many human autoimmune diseases. Th17 cells, their developmental pathways and their effector functions, theref...
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abstract::The immune response against human adenovirus (HAdV) has gained interest because of the application of HAdV-based vectors in gene therapy and the high incidence of infections in pediatric recipients of allogeneic stem cell grafts. Because antiviral medication is frequently ineffective, the option of adoptive transfer o...
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journal_title:European journal of immunology
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journal_title:European journal of immunology
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abstract::The transferrin receptor (TfR) was recently proposed as putative natural killer (NK) cell target structure. Here data are presented against this hypothesis and it is shown that low TfR expression and high NK sensitivity can occur concommitantly . K562 cells were studied at various stages of cell proliferation. No chan...
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